1 use std::convert::TryFrom;
5 use rustc_codegen_ssa::METADATA_FILENAME;
6 use rustc_data_structures::owning_ref::{self, OwningRef};
7 use rustc_data_structures::rustc_erase_owner;
8 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
9 use rustc_middle::ty::TyCtxt;
10 use rustc_session::config;
11 use rustc_target::spec::Target;
13 use crate::backend::WriteMetadata;
15 pub(crate) struct CraneliftMetadataLoader;
17 impl MetadataLoader for CraneliftMetadataLoader {
22 ) -> Result<owning_ref::ErasedBoxRef<[u8]>, String> {
23 let mut archive = ar::Archive::new(File::open(path).map_err(|e| format!("{:?}", e))?);
24 // Iterate over all entries in the archive:
25 while let Some(entry_result) = archive.next_entry() {
26 let mut entry = entry_result.map_err(|e| format!("{:?}", e))?;
27 if entry.header().identifier() == METADATA_FILENAME.as_bytes() {
28 let mut buf = Vec::with_capacity(
29 usize::try_from(entry.header().size())
30 .expect("Rlib metadata file too big to load into memory."),
32 ::std::io::copy(&mut entry, &mut buf).map_err(|e| format!("{:?}", e))?;
33 let buf: OwningRef<Vec<u8>, [u8]> = OwningRef::new(buf).into();
34 return Ok(rustc_erase_owner!(buf.map_owner_box()));
38 Err("couldn't find metadata entry".to_string())
39 //self.get_dylib_metadata(target, path)
42 fn get_dylib_metadata(
46 ) -> Result<owning_ref::ErasedBoxRef<[u8]>, String> {
47 use object::{Object, ObjectSection};
48 let file = std::fs::read(path).map_err(|e| format!("read:{:?}", e))?;
49 let file = object::File::parse(&file).map_err(|e| format!("parse: {:?}", e))?;
51 .section_by_name(".rustc")
52 .ok_or("no .rustc section")?
54 .map_err(|e| format!("failed to read .rustc section: {:?}", e))?
56 let buf: OwningRef<Vec<u8>, [u8]> = OwningRef::new(buf).into();
57 Ok(rustc_erase_owner!(buf.map_owner_box()))
61 // Adapted from https://github.com/rust-lang/rust/blob/da573206f87b5510de4b0ee1a9c044127e409bd3/src/librustc_codegen_llvm/base.rs#L47-L112
62 pub(crate) fn write_metadata<P: WriteMetadata>(
65 ) -> EncodedMetadata {
66 use flate2::write::DeflateEncoder;
67 use flate2::Compression;
70 #[derive(PartialEq, Eq, PartialOrd, Ord)]
82 config::CrateType::Executable
83 | config::CrateType::Staticlib
84 | config::CrateType::Cdylib => MetadataKind::None,
86 config::CrateType::Rlib => MetadataKind::Uncompressed,
88 config::CrateType::Dylib | config::CrateType::ProcMacro => MetadataKind::Compressed,
91 .unwrap_or(MetadataKind::None);
93 if kind == MetadataKind::None {
94 return EncodedMetadata::new();
97 let metadata = tcx.encode_metadata();
98 if kind == MetadataKind::Uncompressed {
102 assert!(kind == MetadataKind::Compressed);
103 let mut compressed = tcx.metadata_encoding_version();
104 DeflateEncoder::new(&mut compressed, Compression::fast())
105 .write_all(&metadata.raw_data)
108 product.add_rustc_section(
109 rustc_middle::middle::exported_symbols::metadata_symbol_name(tcx),
111 tcx.sess.target.target.options.is_like_osx,